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comScore Releases April 2010 U.S. Search Engine Rankings

RESTON, VA, May 11, 2010 – comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released its monthly comScore qSearch analysis of the U.S. search marketplace. In April 2010, Americans conducted 15.5 billion core searches, with Google Sites leading the market with 64.4 percent share of core searches conducted.

April 2010 U.S. Core Search Rankings

Google Sites led the U.S. core search market in April with 64.4 percent of the searches conducted, followed by Yahoo! Sites (up 0.8 percentage points to 17.7 percent), and Microsoft Sites (up 0.1 percentage points to 11.8 percent). Both Yahoo! Sites and Microsoft Sites have experienced gains due in part to the introduction of new site navigation experiences that tie content and related search results together within several channels. These features provide search results to users as they navigate through topical content and meet comScore’s established criteria for counting search queries. Ask Network captured 3.7 percent of the search market, followed by AOL LLC with 2.4 percent.

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

April 2010 U.S. Expanded Search Rankings

In the April analysis of the top properties where search activity is observed, Google Sites led the search market with 14.0 billion search queries, followed by Yahoo! Sites with 2.8 billion queries and Microsoft Sites with 1.9 billion. Amazon Sites experienced sizeable growth during the month with an 8-percent increase to 245 million searches, rounding off the top 10 ranking.

About comScorecomScore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo.